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Thread: Clogged Backwash Drain Line

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    Clogged Backwash Drain Line

    Hi. The pipe that drains water and DE from my filter during backwashing is clogged (the drain line goes directly to the sewer). I applied pressure to the line via garden hose and a pool maintenance man applied pressurized air. In both cases the clog held (the pool guy said he's never heard of a backwash line clogging). I'd like to know if anyone has heard of or experienced this problem and, if so, what the solution was. Thanks in advance for your advice.

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida
    Hi, Kevin,

    Welcome to TFP. That's pretty difficult to clog the backwash line, Assuming it's pvc pipe, nothing can get in to clog it unless it's broken somewhere. My only other thought is that the drain end may be clogged from something backing up in the sewer.

    Never heard of it and have no clue. Since you can get air to it, I assume you can snake it.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Some animal may have crawled in from the sewer end and died in there, try drano, it may be enough to break a bit of it down around the perimeter and allow it to flush out.

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    What about using what we call a 'water weenie'? Somebody has posted photos and the real name before... it is a rubber hose-end attachment that you put into the unclogged end of pipe. Turn on the water, and the pressure builds up in it, and it swells up to close off the pipe. Then when the pressure gets high, it blasts out the clog.
    You can get them at HD or other hardware store.

    In re-reading this description, well,

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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